尼泊尔地震发生后，外交部第一时间紧急协调民航局等相关部门，已有12架中国民航客机接回1600余名我在（）机场滞留人员。

A、孟买

B、伊斯兰堡

C、加德满都

D、仰光

The ratio of 2 quantifies is 5 to 6. If each of the quantities is increased by 15, what is the ratio of these two new quantifies ？（）

A. 5:6

B. 25:27

C. 15:16

D. 20:21

E. It cannot be determined from the information given.